]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commitdiff
HID: hidraw, fix a NULL pointer dereference in hidraw_write
authorAntonio Ospite <ospite@studenti.unina.it>
Tue, 5 Oct 2010 15:20:17 +0000 (17:20 +0200)
committerJiri Kosina <jkosina@suse.cz>
Wed, 6 Oct 2010 09:30:34 +0000 (11:30 +0200)
BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
IP: [<ffffffffa0f0a625>] hidraw_write+0x3b/0x116 [hid]
[...]

This is reproducible by disconnecting the device while userspace writes
to dev node in a loop and doesn't check return values in order to exit
the loop.

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Cc: stable@kernel.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
drivers/hid/hidraw.c

index 9eaf6ae5f97faa8ec047c6546f02b306394052ef..a3866b5c0c43da58bceae7bb463a2780846454be 100644 (file)
@@ -109,6 +109,12 @@ static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t
        int ret = 0;
 
        mutex_lock(&minors_lock);
+
+       if (!hidraw_table[minor]) {
+               ret = -ENODEV;
+               goto out;
+       }
+
        dev = hidraw_table[minor]->hid;
 
        if (!dev->hid_output_raw_report) {